/*!	 widgets/widget_ruler.h
**	 Template Header
**
**	......... ... 2014 Ivan Mahonin
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifndef __SYNFIG_STUDIO_WIDGET_RULER_H
#define __SYNFIG_STUDIO_WIDGET_RULER_H

#include <sigc++/sigc++.h>

#include <gtkmm/drawingarea.h>
#include <pangomm/layout.h>

#include <synfig/real.h>
#include <synfig/string.h>

namespace studio
{

class Widget_Ruler : public Gtk::DrawingArea
{
private:
    bool is_vertical;
    Glib::RefPtr<Pango::Layout> layout;
    synfig::Real min;
    synfig::Real max;
    synfig::Real position;

    void draw_line(
        const ::Cairo::RefPtr< ::Cairo::Context>& cr,
        synfig::Real position,
        synfig::Real size,
        const Gdk::RGBA &color,
        synfig::Real width,
        synfig::Real height);

    void draw_text(
        const ::Cairo::RefPtr< ::Cairo::Context>& cr,
        synfig::Real position,
        const synfig::String &text,
        int size,
        const Gdk::RGBA &color,
        synfig::Real offset,
        synfig::Real width,
        synfig::Real height);

public:
    Widget_Ruler(bool is_vertical);
    ~Widget_Ruler();

    synfig::Real get_screen_min() const
    {
        return 0.0;
    }
    synfig::Real get_screen_max() const
    {
        return (synfig::Real)(is_vertical ? get_height() : get_width());
    }

    synfig::Real position_to_screen(synfig::Real value) const
    {
        return (value - min) / (max - min) * (get_screen_max() - get_screen_min()) + get_screen_min();
    }
    synfig::Real position_from_screen(synfig::Real value) const
    {
        return (value - get_screen_min()) / (get_screen_max() - get_screen_min()) * (max - min) + min;
    }

    synfig::Real distance_to_screen(synfig::Real value) const
    {
        return value / (max - min) * (get_screen_max() - get_screen_min());
    }
    synfig::Real distance_from_screen(synfig::Real value) const
    {
        return value / (get_screen_max() - get_screen_min()) * (max - min);
    }

    synfig::Real get_min() const
    {
        return min;
    }
    void set_min(synfig::Real value);

    synfig::Real get_max() const
    {
        return max;
    }
    void set_max(synfig::Real value);

    synfig::Real get_position() const
    {
        return position;
    }
    void set_position(synfig::Real value);

    synfig::Real get_screen_position() const
    {
        return position_to_screen(get_position());
    }
    void set_screen_position(synfig::Real value)
    {
        set_position(position_from_screen(value));
    }

    bool on_draw(const ::Cairo::RefPtr< ::Cairo::Context>& cr);
}; // END of class Widget_Ruler

}; // END of namespace studio

#endif